US4655275A - Tool, particularly an injection mold - Google Patents

Tool, particularly an injection mold Download PDF

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Publication number
US4655275A
US4655275A US06/806,286 US80628685A US4655275A US 4655275 A US4655275 A US 4655275A US 80628685 A US80628685 A US 80628685A US 4655275 A US4655275 A US 4655275A
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United States
Prior art keywords
clamping
fast
plates
receiving
tool
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US06/806,286
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English (en)
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Alois Worner
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17—Component parts, details or accessories; Auxiliary operations
    • B29C45/1742—Mounting of moulds; Mould supports
    • B29C45/1743—Mounting of moulds; Mould supports using mounting means projecting from the back side of the mould or from the front side of the mould support
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00—Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/0063—Connecting non-slidable parts of machine tools to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/30—Mounting, exchanging or centering
    • B29C33/305—Mounting of moulds or mould support plates
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S100/00—Presses
    • Y10S100/918—Bolster and die

Definitions

  • the present invention relates to a tool with two tool halves which are movable relative to one another and mountable on a receiving plate of a machine.
  • Each of the tool halves is connected fixedly and releasably by a fast coupling means with a fast clamping plate mountable on the respective receiving plate of the machine.
  • the fast coupling means have several clamping pins, which project over the respective tool halves and are received in respective receiving openings of the fast clamping plate associated with the respective tool half.
  • the fast coupling means also includes locking elements which form-lockingly engage in transverse openings or recesses extending substantially perpendicularly to the longitudinal axis of the clamping pins.
  • the locking elements are received in bearing openings which extend perpendicularly to the receiving openings of the clamping pins, and are displaceable out of their engaging positions in the transverse openings or recesses of the clamping pins.
  • the present invention relates to an injection mold with mold halves which are mountable on the respective vertically extending receiving plates of an injection molding machine.
  • tool half or “mold half” in the sense of the present invention mean both parts of a tool or a mold which are movable relative to one another, even in the case when the separation plane does not extend along the center of the tool or of the mold, and the oppositely movable parts of the tool or of the mold can be formed differently from one another.
  • Tools which have tool or mold halves that are rigidly, yet releasably connectable by fast coupling means with fast clamping plates, which are mountable on the receiving plates of the respective machines.
  • the PCT application WO No. 83/01038 discloses a mounting arrangement for the mold tool of an injection molding machine on mold supports, in which clamping pins extend laterally from the mold halves of a mold tool, and engage in the respective recesses in the mold support plates.
  • the mold support plates have guides which extend perpendicularly to the above-mentioned recesses for receiving the clamping means in the coupling positions. Wedges are movably received in the guides, and form locking means for the clamping pins, so that in the locking position the wedges extend through the transverse openings of the clamping pins and secure the latter in their positions.
  • a cylinder-piston unit which utilizes a hydraulic fluid, serves for actuation of the locking means formed as wedges, between, on one hand, their locking positions, in which they engage in the transverse openings of the clamping means, and, on the other hand, their released positions, in which they are withdrawn from the clamping means.
  • the DE-OS No. 3,140,837 also discloses a pressure molding machine with a similar mounting arrangement for the mold tools on the mold support plates of the machine.
  • the clamping pins extend laterally from the mold support halves of the mold tool, and engage in respective openings of the machine plates, and wedges which are axially movable perpendicularly to the above-mentioned recesses in respective guiding openings arrest the clamping pins, so as to form-lockingly engage portions of the clamping pins received in the recesses in the coupling position.
  • one feature of the present invention resides, briefly stated, in a tool in which the clamping pins have portions which engage in a coupling position respective receiving openings extending in fast clamping plates perpendicularly to the plane of their plates, and wherein these portions of the clamping pins are provided with cones which narrow toward free ends of the clamping pins.
  • clamping pins When the clamping pins are formed in accordance with the present invention, they can be easily inserted into their receiving openings and simultaneously centered, on one hand, and also can be uncoupled in a trouble-free manner, so as to separate a tool half from the associated fast clamping plate in the coupling position, on the other hand.
  • the receiving openings for the clamping pins which are provided in the fast clamping plates and extend perpendicularly to the plane of the plate, are formed as conical openings corresponding to the cones of the clamping pins.
  • the thus formed mounting arrangement for the inventive tool which includes two clamping pins for each tool half, ensures not only its coupling functions, but also a positionally correct arrangement of a tool half and a fast clamping plate relative to one another, so that no other centering means or special alignment of the tool during mounting is required.
  • the locking elements which are displaceably received in an axial direction in the bearing openings of the fast clamping plates, include rotatably supported locking rods with eccentric clamping cams, which engage in their coupling position in transverse recesses of respective clamping pins, the eccentric clamping cams being clamped to clamping faces of the transverse recesses.
  • the locking rods are axially shifted into their respective bearing openings, so as to form-lockingly engage in the transverse recesses of the clamping pins in a holding position. Therefore in this position the respective tool half has already been arrested, or held on the respective associated fast clamping plate.
  • the transverse recesses in the portions of the clamping pins, which engage in the coupling position the receiving openings of the fast clamping plates are formed as approximately U-shaped recesses open at one side, which extend substantially along the longitudinal axis of the clamping pins, and which are limited by respective clamping surfaces at the side facing the respective free end of the clamping pins.
  • FIG. 1 is an elevation view of an injection mold serving as a tool, and which is received between a stationary plate and a movable receiving plate of an injection molding machine;
  • FIG. 2 is a perspective view of the injection mold of FIG. 1 in the mounted position in part-section;
  • FIG. 3 is an exploded perspective view of a fast clamping plate with respective clamping pins, and a locking rod;
  • FIG. 4 is a view showing the locking rod on an enlarged scale
  • FIG. 5 is a view showing the locking rod as seen in the direction of the arrow V in FIG. 4 toward an eccentric clamping cam;
  • FIG. 6 is a large-scale view of a clamping pin
  • FIG. 7 is a view showing a section of a fast clamping plate with a conical receiving opening for a clamping pin.
  • FIG. 8 is a view showing cooperation of the eccentric clamping cam of the locking rod with a transverse recess in the clamping pin.
  • An injection mold 10 shown in FIG. 2 has two mold halves 12 and 13 which are separated by a partition joint 11 and provided with outer plates 14 and 15.
  • the plates 14 and 15 are received between fast clamping plates 16 and 17 and fixably but removably connected with the latter by fast coupling means which will be described herein below.
  • the fast clamping plates 16 and 17 are provided with centering projections 19 in the region of recesses 18 at their sides which face away from one another.
  • the centering projections 19 engage the centering openings 22 of the above mentioned receiving plates 20 and 21, and thereby provide centering of the mold halves 12 and 13 with respect to the receiving plates 20 and 21 of the machine.
  • the fast clamping plates 16 and 17 are rigidly and releasably connected with the receiving plates 20 and 21 of the machine by mounting screws which are not shown.
  • the fast clamping plates 16' and 17' are not provided with centering projections, but instead with a recess which is self-locking on rotation, and which corresponds to the centering opening 22 in the receiving plates 20 and 21, and into which a centering ring 19' has been inserted.
  • the centering rings 19' simultaneously engage the centering openings 22 of the neighboring receiving plates 20 and 21 of the machine and provide, similarly to the projections 19 of the embodiment of FIG. 2, a positionally correct mounting of the fast clamping plates 16' and 17' on the receiving plates 20 and 21 of the machine.
  • the screws for mounting the fast clamping plates 16' and 17' on the receiving plates 20 and 21 of the machine are also not shown.
  • the first coupling means for rigid and at the same time releasable connection of the mold halves 12 and 13 with respective fast clamping plates 16 and 17 or 16' and 17' include clamping pins 24, which rigidly connect the mold halves 12 and 13 with outer plates 14 and 15, and extend beyond the planes of the above mentioned plates 14 and 15.
  • the fast coupling means also include the receiving openings 25, which are arranged in the fast clamping plates 16,17 or 16',17' at locations matching those of the clamping pins 24, and which extend perpendicularly to the plane of the aformentioned fast clamping plates 16, 17 or 16', 17'.
  • the receiving openings 25 are arranged symmetrically with respect to a vertical plane intersecting the centering opening 18, and extending through the respective fast clamping plates 16, 17 or 16', 17', and also symmetrically relative to the receiving opening 18.
  • the fast coupling means include locking rods 26 which are received in bearing openings 27, as clearly shown in FIGS. 2 and 3, and extend within the plane of a respective fast clamping plate 16, 17 or 16', 17' perpendicularly to the receiving openings 25 for the clamping pins 24, so as to intersect the receiving openings 25 at a location spaced from the center of the fast clamping plate 16, 17 or 16', 17'. This will be described in detail hereinbelow.
  • each of the locking rods 26 has a pin portion 28, which corresponds to the bearing opening 27, and is limited on one side thereof by a ring-shaped flange 29 that is connected with a wrench abutment portion 30.
  • the pin portion 28 is connected with an eccentric clamping cam 31, and the latter is connected with a bearing pin 32, which extends coaxially to the pin portion 28 and has a diameter smaller than the diameter of the pin portion 28.
  • the clamping pins 24 are rigidly connected with the outer plates 14 and 15 of the two tool halves 12 and 13, and extend outwardly beyond the outer surfaces of these outer plates 14 and 15. As shown particularly in FIG. 6, each of the clamping pins 24 is provided at its side facing towards its respective tool half 12 or 13 with a pin head 34, each of which is received in the respective tool half 12 or 13. At the pin end which is distal from the pin head 34, each clamping pin 24 is provided with a narrowing cone 42. Each clamping pin 24 is also provided with a transverse recess 37 in the vicinity of its end extending outwardly beyond the outer plates 14 and 15.
  • Each transverse recess 37 extends perpendicularly to the axis 36 of a respective clamping pin 24, to a depth approximately of the axis 36, and is formed as a substantially U-shaped cut-out, which is open at one side.
  • the cone 42 extends over the entire length of the pin portion which in a mounted condition laterally projects beyond the plates 14 and 15, which plates limit the respective tool halves 12 and 13 laterally.
  • the clamping pin portion between the cone 42 and the pin head 34 which in the mounted position is received in the plates 14 and 15 is, however, implemented as a cylindrical portion.
  • the cone 42 has, as can be seen from FIG. 6, only a small angle of convergence, and the transverse recesses 37 are arranged in the region of the conical portion.
  • a receiving hole 25 which intersects a bearing opening 27 for a locking rod 26 at a location distant from the center of a respective fast clamping plate 16, 17 or 16', 17' is formed as a conical opening, so as to match the shape of the cone 42 of the clamping pin 24.
  • the receiving openings 25 for the clamping pins 24, and the bearing openings 27 for receiving the locking rods 26 extend perpendicularly relative to one another in the fast clamping plates 16, 17 or 16', 17', and intersect one another. As can be seen from FIG. 8, they are offset relative to one another by a distance 38, so that when the clamping pins 24 are in the clamping position and the locking rods 26 are in the locking position, the locking pins 26 engage with their eccentric clamping cams 31 the transverse recesses in the clamping pins 24, as shown in FIG. 8.
  • each locking rod 26 In this mounted position, a rotation of each locking rod 26 about its longitudinal axis 40 causes the eccentric clamping cams 31 to cooperate with the clamping surfaces 41 of the transverse recesses 37 in the clamping pins 24, and therefore results in a precise securement of the associated tool halves 12, 13 to the fast clamping plates 16, 17 or 16', 17'; each such fast clamping plate 16, 17 or 16', 17', in turn, is mounted on the respective receiving plate 20, 21 of the machine in a rigid and yet releasable manner.
  • the fast clamping plates 16 and 17 or 16' and 17' are mounted on the receiving plates 20 and 21 in the manner shown in FIG. 1, and the position of the fast clamping plates 16, 17 or 16', 17' is ensured by the centering projection 19, or by the centering sleeve 19'.
  • Mounting of the fast clamping plates 16, 17 or 16', 17' on the above mentioned receiving plates 20 and 21 is performed in a known manner by means of mounting screws which are not shown.
  • the locking rods 26 are withdrawn from their bearing openings 27 and 39 by such a measure for the purpose of mounting the tool, that the eccentric clamping cam 31 and the bearing pin 32 no longer extend into the receiving openings 25 of the clamping pins 24.
  • the tool 10 which is provided with the clamping pins 24 can be mounted in such a manner that the tool 10 is inserted in a correct position between the receiving plates 20 and 21 provided with the fast clamping plates 16, 17 or 16', 17'. Then first the clamping pins 24 of the tool half 13 which is close to the stationary receiving plate 21 of the machine are inserted into the receiving openings 25 in the fast clamping plate 17 or 17', which is mounted on the above-mentioned receiving plate 21.
  • the locking rods 26 are axially displaced in their bearing openings 27 and 39 so that the eccentric clamping cams 31 engage the transverse recesses 37 at the ends of the clamping pins 24, and the bearing pins 32, which adjoin these eccentric clamping cams 31, are received in the appropriately dimensioned bearing openings 39.
  • the locking rods 26 need only to be rotated about their longitudinal axes 40 into an engaging position with the recesses 37 of the clamping pins 24, so as to attain, due to cooperation of the eccentric clamping cams 31 with the clamping surfaces 41 of the transverse recesses 37, a form-locking rigid connection of the tool half 13 with the associated fast clamping plate 17 or 17'.
  • Clamping of the other tool half 12 is then performed in such a manner that the movable receiving plate 20, which is also provided with a fast clamping plate 16 or 16', and is received in transverse guidances 43 and 44, not further described in detail, is moved onto the tool 10 in the direction of the double arrow 45 shown in FIG. 1, relative to the stationary receiving plate 21.
  • the receiving plate 20, in turn is held, for example, by means of a crane, or is otherwise supported in an appropriate position. This movement is performed until the clamping pins 24 of this tool half 12 completely engage the receiving openings 25 of the fast clamping plate 16 or 16' arranged on the movable receiving plate 20. Insertion of the associated locking rods 26 into their bearing openings 27 and 39, and rotation of the locking rods 26 into their clamping positions then results in clamping of this tool half 12 to the above-mentioned fast clamping plate 16 or 16'.
  • the displacement of the tool 10 from the stationary receiving plate 21 of the machine is performed until the clamping pins 24 which are associated with the adjacent tool half 13, are disengaged from the receiving openings 25 of the fast clamping plate 17 or 17' associated with the receiving plate 21.
  • the tool is then freed, and can be removed from the machine in a manner not further described, and be replaced by another tool 10, whose mounting is performed in the above-described manner.
  • each tool half 12 and 13 has four clamping pins 24, which are received in the receiving openings 25 arranged in the respective fast clamping plate 16, 17 or 16', 17' in the appropriate position, and thereby center and secure the position of the tool half 12 or 13 relative to the respective fast clamping plate 16, 17 or 16', 17'. It is to be understood that depending on the characteristics of the tool 10 and/or the stresses which occur during opening of the tool 10, any other number of clamping pins 24 can also be provided. For appropriate positioning of the respective tool half 12 or 13 relative to the associated fast clamping plate 16, 17 or 16', 17', each tool half 12 or 13 is to be provided with at least two clamping pins 24.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US06/806,286 1984-12-08 1985-12-06 Tool, particularly an injection mold Expired - Lifetime US4655275A (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE3444800 1984-12-08
DE3444800 1984-12-08
DE3510329 1985-03-22
DE19853510329 DE3510329A1 (de) 1984-12-08 1985-03-22 Werkzeug, insbesondere spritzgiessform

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US4655275A true US4655275A (en) 1987-04-07

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US06/806,286 Expired - Lifetime US4655275A (en) 1984-12-08 1985-12-06 Tool, particularly an injection mold

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EP (1) EP0184744B1 (fr)
DE (2) DE3510329A1 (fr)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828479A (en) * 1987-08-25 1989-05-09 Pleasant Ronald E Molding apparatus
US4881715A (en) * 1988-12-30 1989-11-21 Holdt J W Von Safety lift lock with internal member
US4959002A (en) * 1987-08-25 1990-09-25 Pleasant Ronald E Inserts for injection mold machine
US5078586A (en) * 1989-09-07 1992-01-07 Battenfeld Gmbh Arrangement for securing a die to a die holder
US5302103A (en) * 1991-10-10 1994-04-12 Gencorp Inc. Injection molding machine including quick-change mold assembly
WO2001098049A1 (fr) * 2000-06-16 2001-12-27 D-M-E Company Dispositif de verrouillage pour moules a injection pourvu d'elements amovibles
US20030082262A1 (en) * 2001-10-25 2003-05-01 Alfred Effenberger Mold tool clamping device for blow mold machines
US20070048399A1 (en) * 2005-08-30 2007-03-01 Fields Randal L Quick change blow mold tooling
US20090324767A1 (en) * 2008-06-30 2009-12-31 Caterpillar Inc. Repair tool for injection molding hot runner system
CN105170961A (zh) * 2015-09-28 2015-12-23 无锡蠡湖增压技术股份有限公司 一种重力浇铸机用金属模快速切换器

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT388329B (de) * 1987-08-18 1989-06-12 Engel Gmbh Maschbau Spritzgiessform
DE8813924U1 (de) * 1988-11-08 1989-02-16 Wörner, Alois, 7580 Bühl Spannvorrichtung für Werkzeuge mit über seitliche Aufspannflächen vorstehenden Spannbolzen
FI82899C (fi) * 1989-01-20 1991-05-10 Mauno Montonen Form.
DE4100981C2 (de) * 1991-01-15 2001-12-13 Fritz Lutz Handbetätigbare Schnellspannvorrichtung für Spritzgießwerkzeuge
DE4416311A1 (de) * 1994-05-09 1995-11-16 Itw Oberflaechentechnik Gmbh Sprühgerät-Befestigungsvorrichtung
DE102010026832A1 (de) * 2010-07-12 2012-01-12 Röders Gmbh Mehrteilige Blasform, insbesondere für die Herstellung von Kunststofflaschen

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US3229791A (en) * 1962-07-11 1966-01-18 Federal Warco Division Apparatus for use with presses and the like
US3702560A (en) * 1971-05-05 1972-11-14 Rohr Industries Inc Quick replacement mechanism for mounting dies in press
US3862565A (en) * 1972-06-15 1975-01-28 Tassell Leslie E Pressure pin capturing system for traveling bolsters
US4274332A (en) * 1979-04-11 1981-06-23 Iwao Nakamura Die changing apparatus for press
US4484880A (en) * 1981-09-14 1984-11-27 Ludwig Engel Kg Clamping device for clamping the form tools of an injection molding machine to form supports

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NL184238B (nl) * 1954-01-12 Garrett Corp Warmtewisselaar.
US2816770A (en) * 1955-09-07 1957-12-17 Vlieg Corp De Tool holder and adapter
AT381893B (de) * 1981-11-06 1986-12-10 Orlik Josef Aufspannvorrichtung

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3229791A (en) * 1962-07-11 1966-01-18 Federal Warco Division Apparatus for use with presses and the like
US3702560A (en) * 1971-05-05 1972-11-14 Rohr Industries Inc Quick replacement mechanism for mounting dies in press
US3862565A (en) * 1972-06-15 1975-01-28 Tassell Leslie E Pressure pin capturing system for traveling bolsters
US4274332A (en) * 1979-04-11 1981-06-23 Iwao Nakamura Die changing apparatus for press
US4484880A (en) * 1981-09-14 1984-11-27 Ludwig Engel Kg Clamping device for clamping the form tools of an injection molding machine to form supports

Cited By (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4828479A (en) * 1987-08-25 1989-05-09 Pleasant Ronald E Molding apparatus
US4959002A (en) * 1987-08-25 1990-09-25 Pleasant Ronald E Inserts for injection mold machine
US4881715A (en) * 1988-12-30 1989-11-21 Holdt J W Von Safety lift lock with internal member
US5078586A (en) * 1989-09-07 1992-01-07 Battenfeld Gmbh Arrangement for securing a die to a die holder
US5302103A (en) * 1991-10-10 1994-04-12 Gencorp Inc. Injection molding machine including quick-change mold assembly
AU2001268430B2 (en) * 2000-06-16 2004-09-16 D-M-E Company Latching device for injection molds with removable inserts
US20030209832A1 (en) * 2000-06-16 2003-11-13 Steil Frederick G. Latching device for injection molds with removable inserts
WO2001098049A1 (fr) * 2000-06-16 2001-12-27 D-M-E Company Dispositif de verrouillage pour moules a injection pourvu d'elements amovibles
US6802704B2 (en) * 2000-06-16 2004-10-12 D-M-E Company Latching device for injection molds with removable inserts
US20030082262A1 (en) * 2001-10-25 2003-05-01 Alfred Effenberger Mold tool clamping device for blow mold machines
US6851944B2 (en) * 2001-10-25 2005-02-08 Hesta-Graham Gmbh & Co Kg Mold tool clamping device for blow mold machines
US20070048399A1 (en) * 2005-08-30 2007-03-01 Fields Randal L Quick change blow mold tooling
US7381045B2 (en) * 2005-08-30 2008-06-03 R & D Tool & Engineering Co. Quick change blow mold tooling
US20090324767A1 (en) * 2008-06-30 2009-12-31 Caterpillar Inc. Repair tool for injection molding hot runner system
US7993125B2 (en) * 2008-06-30 2011-08-09 Caterpillar Inc. Repair tool for injection molding hot runner system
CN105170961A (zh) * 2015-09-28 2015-12-23 无锡蠡湖增压技术股份有限公司 一种重力浇铸机用金属模快速切换器
CN105170961B (zh) * 2015-09-28 2018-01-12 无锡蠡湖增压技术股份有限公司 一种重力浇铸机用金属模快速切换器

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DE3510329A1 (de) 1986-06-12
EP0184744A2 (fr) 1986-06-18
EP0184744B1 (fr) 1991-04-10
EP0184744A3 (en) 1988-03-30
DE3582481D1 (de) 1991-05-16

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